Re: [Qemu-devel] qvm86, kqemu and video speed

[Oliver Gerlich <olig9@gmx.de>]

Thomas Steffen schrieb:
> On 4/13/05, Hetz Ben Hamo <hetzbh@gmail.com> wrote:
> 
> 
>>Anyone thought about using XFree's Xv extension? last time I heard, it
>>works with all the cards, supported well under XFree, and I think it
>>will be better working rather with DGA..
> 
> 
> Xv has its denefits, but I am not sure that it is the right tool for
> the job here. Xv does hardware colorspace expansion, from the color
> compression usually done in JPEG/MPEG to the RGB. This is the main
> reason that it works better for video, but obviously we don't need
> this (unless we want to play videos inside of QEMU).
> 
> And most graphics cards support only one Xv area, which is treated as
> an overlay. That would be a serious restriction, because you could not
> use Xine and QEMU together on one screen.
> 
> So I would think that DGA is the way to go first.
>
> Thomas
>

Please no DGA :)

This is one of the reasons why I don't use VMWare - it needs DGA for
fullscreen mode, and my %&§&% ATI 9200 with this &§$/$%&/% fglrx driver
doesn't like DGA (yes, ok, ATI does make progress: at least dga doesn't
now crash the whole system with the current drivers...)

So I hope that qemu won't use DGA for faster graphics - I think
optimizing the current driver and maybe adding some host-OpenGL support
would be quite an improvement. Besides, such changes would also improve
Qemu on MacOS or Windows, not only on Linux.

Oliver

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